TY - PAT A1 - Chao, Chen-Xiang A1 - Krüger, David T1 - Gear wheel Y1 - 2020 UR - https://patents.google.com/patent/US20220316574A1/en?inventor=Chen-Xiang+Chao ER - TY - CHAP A1 - Chao, Chen-Xiang A1 - Bestle, Dieter A1 - Krüger, D. A1 - Meissner, Bernd T1 - Increasing the tooth root capacity of symmetric and asymmetric gears by optimizing the tooth root fillet shape T2 - International Gear Conference 2018, Lyon, 27.-29.08.2018, vol. 1 N2 - The international standard ISO 6336-3 defines a calculation method for the tooth root capacity of standard gears with basic rack profile according to ISO 53. However, the results of this method may become too optimistic for non-standard gears with custom root fillets, large pressure angles or asymmetric teeth, since the effect of general mean stresses on the local tooth root strength are neglected. Therefore, a more generic calculation method is suggested, which considers the mean stress influence by utilizing the Haigh diagram. Both approaches are then used as basis of root fillet shape optimizations. A comparison of results demonstrates significant differences in the safety assessment and the resulting root geometry. Y1 - 2018 SN - 978-1-911033-42-4 SP - 531 EP - 541 PB - Chartridge Books Oxford CY - Oxford ER - TY - PAT A1 - Chao, Chen-Xiang A1 - Krüger, David A1 - Flassig, Peter Michael A1 - Meissner, Bernd T1 - Verfahren zur Herstellung einer Verzahnung und Verzahnung Y1 - 2018 UR - https://patents.google.com/patent/DE102018108753A1/de?inventor=Chen-Xiang+Chao ER - TY - PAT A1 - Chao, Chen-Xiang A1 - Krüger, David T1 - Stegzahnrad Y1 - 2019 UR - https://patents.google.com/patent/DE102019211451A1/de?inventor=Chen-Xiang+Chao ER - TY - GEN A1 - Chao, Chen-Xiang A1 - Bestle, Dieter A1 - Krüger, David A1 - Meissner, Bernd T1 - Zahnfußtragfähigkeitsoptimierung von Stirnrädern für den Einsatz in Hochleistungsgetrieben mithilfe von Isight T2 - Tagungsband Simulia Anwenderkonferenz, DASSAULT SYSTÈMES User Conference, Hanau, 4.-6. Dezember 2018 Y1 - 2018 UR - https://www.3ds.com/events/dassault-systemes-user-conferences/dassault-systemes-user-conference-germany-2018/download-archive/ UR - https://www.3ds.com/fileadmin/EVENTS/3DS-Events-img/3DS_USER_CONFERENCE_GER_2019/DownloadArchive/2018-DSUC-Chao-UNI-Senftenberg.pdf CY - Hanau ER - TY - PAT A1 - Chao, Chen-Xiang A1 - Krüger, David A1 - Flassig, Peter Michael A1 - Meissner, Bernd T1 - Method for manufacturing a toothing and toothing Y1 - 2019 UR - https://patents.google.com/patent/DE102018108753A1/en?inventor=Chen-Xiang+Chao ER - TY - THES A1 - Chao, Chen-Xiang T1 - Strategies for Optimizing the Tooth Root Load Capacity of High-Performance Gears N2 - Abstract Strategies for Optimizing the Tooth Root Load Capacity of High-Performance Gears Keywords: planet gears, high-performance gearbox, tooth root load capacity, tooth root optimization, multi-objective optimization In order to achieve greater efficiency, many modern applications such as geared turbofans require high-performance gearboxes with excellent reliability and low weight. The tooth root load capacity often is a limiting design criterion driving minimum face widths and hence the weight of gears. Consequently, strategies for optimizing the tooth root load capacity of gears are explored in this thesis. Two methods for tooth root load capacity analysis – a maximum tensile stress method derived from ISO 6336 and a local fatigue approach taking into account mean stress infl – are introduced and ompared to each other with respect to their applicability to optimization problems. A study with 2D fi element models of unidirectionally loaded sun gears reveals that the local fatigue analysis method should be preferred over the common approach of minimizing the maximum tooth root stress, since applying both methods as optimization targets results in diff nt tooth root shapes and a vast overestimation of safety gains when only tensile stresses are considered. Due to alternating loading, planet gears usually have a lower tooth root load capacity than other gears. Additionally, they are often designed with thin rims making the gear body lighter but also more elastic. Therefore, the tooth root shape of a thin-rimmed planet gear is optimized to explore possible interactions. The results show that overly thin rims negatively affect the maximization of tooth root safety. Hence, it is necessary to conduct multi-objectiveoptimizations of planet gears, which maximize tooth root safety and minimize mass simultaneously by optimizing tooth root shape, rim geometry and face width. The efficacy of this approach is demonstrated for 3D gear simulation models of spur as well as double helical planet gears. Pareto-optimal designs show significant improvements compared to the baseline design. Moreover, investigations demonstrate the opportunity to vastly decrease the computational cost of multi-objective optimizations by scalarizing them and using the result to approximate parts of the Pareto front. KW - planet gears, high-performance gearbox, tooth root load capacity, tooth root optimization, multi-objective optimization Y1 - 2022 SN - 978-3-8440-8453-5 PB - Shaker CY - Düren ER - TY - GEN A1 - Chao, Chen-Xiang A1 - Bestle, Dieter A1 - Krüger, David T1 - Isight Process for Optimizing Tooth Roots in a High-Performance Gearbox T2 - 3DExperience Conference Germany 2019At: Darmstadt, Germany Y1 - 2019 UR - https://events.3ds.com/sites/default/Files/3dexperience-conference-chao-tu-cottbus-senftenberg.pdf UR - https://www.researchgate.net/publication/341152054_Isight_Process_for_Optimizing_Tooth_Roots_in_a_High-Performance_Gearbox CY - Darmstadt ER - TY - GEN A1 - Chao, Chen-Xiang A1 - Bestle, Dieter A1 - Krüger, David T1 - Tooth Root Shape Optimization of Thin-Rimmed Planet Gears T2 - Proceedings of ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Volume 10: 2019 International Power Transmission and Gearing Conference N2 - Planetary gearboxes in highly sophisticated applications such as turbofan engines are required to have a high power-to-weight ratio and excellent reliability. Hence, thin-rimmed gear units need to be designed as compact as possible which, however, is usually limited by the tooth root load capacity. In order to come up with the best design, a tooth root shape optimization process is developed for thin-rimmed planet gears. Y1 - 2019 SN - 978-0-7918-5930-8 U6 - https://doi.org/10.1115/DETC2019-97345 ER -